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Best practices

MrJack96

Hi all can someone please give me some advice on the following? 

 

  1. say you’re maintaining a circuit and you realise parts of the circuits do not comply to the regulations what is the standard procedure for example ZS values that do not comply or IR that’s too low. I know in the industrial setting we are pressured to keep things going (critical kit) but say even if we’ve got it in writing we’ve said it’s potentially dangerous and we’ve been told in writing to switch it back on who is then at fault?

 

  1. say the circuit is an old installation and complied at the time of installation if we were then doing work on that circuit say for instance changing adding a spur to sockets that aren’t RCD protected what is the protocol with regards to bringing it up to current standard? 

 

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  • 0

    MrJack96: 
    Yeah I’m thinking the R2 value would probably be a bit bigger then R1. How does that work in practice. I know I’m the regs it states that If ADS cannot be met supplementary bonding has to be used to keep touch voltages bellow 50v I thought this was between conductive parts (referenced to earth) but what about hand to foot in an outside location  ? 

    After working through the relevant regulations I ended up at 419.3. This concerns limiting the Voltage between simultaneously accessible-extraneous conductive-parts and exposed-conductive-parts to 50 Volts A.C. max.

    As it is not possible to bond the ground, the only solution is to wear electrically insulating gloves and footwear when working on the machines outdoors.

    Z.

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  • 0

    MrJack96: 
    Yeah I’m thinking the R2 value would probably be a bit bigger then R1. How does that work in practice. I know I’m the regs it states that If ADS cannot be met supplementary bonding has to be used to keep touch voltages bellow 50v I thought this was between conductive parts (referenced to earth) but what about hand to foot in an outside location  ? 

    After working through the relevant regulations I ended up at 419.3. This concerns limiting the Voltage between simultaneously accessible-extraneous conductive-parts and exposed-conductive-parts to 50 Volts A.C. max.

    As it is not possible to bond the ground, the only solution is to wear electrically insulating gloves and footwear when working on the machines outdoors.

    Z.

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